Kohei Fujii Guitars

Kohei Fujii Guitars

Sunday, June 28, 2015

Body constraction complete and mortise cut

Both Myrtle and Malaysian BW bodies are completed. I also cut mortises for the neck and the body joint. Both bodies showed extremely long-time lasting tap tone. Center sound hole body has much higher resonant frequency than the off-set body. Location of the sound hole changes the fundamental resonate frequency. Due to the longer physical length of the available surface, the off-set sound hole body shows much lower tap-tone frequency. This lower fundamental resonant frequency makes more strong buss. So, I will use 24.9" strings scale for the off-set sound hole body. Shorter string scale improves play-ability. However, shorter strings scale lowers the string tension. To overcome the low tension issue, I will use the super high tension strings for the offset body. As a result, the offset-body makes super easy playing guitar without sacrificing the sound quality. This guitar is going to be my new Jazz nylon model.
     I will use the 25.4" strings scale for the center sound hole design (Malaysian BW). 25.4" scale is still a relatively short as the standard Classical guitar that has normally 25.59" scale. This body is using a super responsible lattice brace with only 1.6mm minimum sound board thickness. My sound board has different thickness depending on the location. This super responsible sound board does not need the long strings scale to drive the top to generate over tones. So, the center sound hole model is also the player friendly guitar with optimum over tone balance.



Sunday, June 21, 2015

Binding install

Binding installation for nylon models are completed except the cut-a-way portion. Myrtle body has the African black-wood binding. Malaysian black-wood body (Negro) has the Bocote binding. Both materials bend pretty easy. The most difficult binding material for bending is Ebony. Ebony is super brittle. Previously, I have been using the Ebony binding. However, I am tired of using the super brittle material. Particularly, the cut-a-way portion is pain-in-the-ass. For me, the African black wood is the best material for the binding. It bends well, and looks excellent. Only drawback is the high price.




Sunday, June 14, 2015

Body detailed work

     Purfling materials are made using Black-white-Brazilian RW-white combination. Purfling installation is also done. Remaining process for the body construction is the binding installation.
     Maple neck making has also made a lot of progress. Head stock shaping is complete. Head veneer is Myrtle. Machine head holes are also drilled. Both maple neck and Mahogany neck will install two way truss rods. I will use super high tension strings for those guitars. Conventional no re-reinforced neck is not able to maintain the neck straight shape if one uses high tension strings. When the nylon strings guitars are new, a little bit extra bowing for the neck and finger board requires occasionally. If so, I have to remove all frets and I need to re-shape the finger-board. It is an extremely time consuming process. To improve the neck set-up time and quality, I will install the two-way truss rod. The two-way truss rod is able to bend the neck both forward and reverse bend. Also, the truss rod is able to greatly improve the future neck maintenance quality.